LMC555CMX Equivalent & Substitute Parts

Part Overview

The LMC555CMX is a 555-type timer/oscillator IC manufactured by Texas Instruments, operating at 3MHz with a supply voltage range of 1.5V to 15V. The device is packaged in 8-SOIC surface mount configuration and is currently in Last Time Buy status. Due to this product status, identifying equivalent and substitute parts with compatible electrical and mechanical specifications is essential for design continuity and procurement planning.

Key Parameters

Parameter	LMC555CMX
Manufacturer	Texas Instruments
Type	555 Type, Timer/Oscillator (Single)
Frequency	3MHz
Voltage - Supply	1.5V ~ 15V
Current - Supply	150 µA
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LMC555CMX is determined by the following criteria:

Package Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts.

Functional Type: All parts must be 555-type timer/oscillator ICs with single-channel configuration to maintain functional equivalence.

Electrical Parameters: Substitute parts must operate within overlapping voltage supply ranges and support the required frequency range. Parts with lower maximum frequency ratings or more restrictive supply voltage ranges are acceptable if the application requirements fall within their specifications.

Compliance Standards: All substitute parts must maintain ROHS3 compliance and MSL Level 1 rating to meet regulatory and environmental requirements.

Product Status: Active status parts are preferred for long-term availability, while Last Time Buy status parts should be evaluated based on inventory levels and project timelines.

Parameter Comparison

Part Number	Manufacturer	Frequency	Voltage - Supply	Current - Supply	Operating Temperature	Packaging	Product Status	Inventory (Pcs)
LMC555CMX	Texas Instruments	3MHz	1.5V ~ 15V	150 µA	-40°C ~ 85°C	Cut Tape (CT)	Last Time Buy	31,720
LMC555CMX/NOPB	Texas Instruments	3MHz	1.5V ~ 15V	150 µA	-40°C ~ 85°C	Tape & Reel (TR)	Active	31,756
ALD7555SAL	Advanced Linear Devices Inc.	2.5MHz	2V ~ 10V	50 µA	0°C ~ 70°C	Tube	Active	1,184
ICM7555CBAZ	Renesas Electronics Corporation	1MHz	2V ~ 18V	60 µA	0°C ~ 70°C	Tube	Active	25,073
ICM7555CBAZ-T	Renesas Electronics Corporation	1MHz	2V ~ 18V	60 µA	0°C ~ 70°C	Cut Tape (CT) & Digi-Reel®	Active	51,420
ICM7555ESA+	Analog Devices Inc./Maxim Integrated	500kHz	2V ~ 16.5V	30 µA	-40°C ~ 85°C	Tube	Active	2,700
ICM7555ESA+T	Analog Devices Inc./Maxim Integrated	500kHz	2V ~ 16.5V	30 µA	-40°C ~ 85°C	Cut Tape (CT) & Digi-Reel®	Active	23,649
ICM7555IBAZ	Renesas Electronics Corporation	1MHz	2V ~ 18V	60 µA	-25°C ~ 85°C	Tube	Active	20,126
ICM7555IBAZ-T	Renesas Electronics Corporation	1MHz	2V ~ 18V	60 µA	-25°C ~ 85°C	Cut Tape (CT) & Digi-Reel®	Active	51,910
ICM7555ISA+	Analog Devices Inc./Maxim Integrated	500kHz	2V ~ 16.5V	30 µA	-20°C ~ 85°C	Tube	Active	2,083
ICM7555ISA+T	Analog Devices Inc./Maxim Integrated	500kHz	2V ~ 16.5V	30 µA	-20°C ~ 85°C	Cut Tape (CT) & Digi-Reel®	Active	21,959

Engineering Selection Recommendations

Direct Parametric Equivalent: LMC555CMX/NOPB is the direct equivalent with identical electrical specifications and 8-SOIC packaging. The primary difference is packaging format (Tape & Reel versus Cut Tape) and Active product status, making it the preferred choice for new designs and long-term availability.

Frequency-Dependent Selection: Applications requiring operation at or below 1MHz can utilize ICM7555 variants (CBAZ, CBAZ-T, IBAZ, IBAZ-T) from Renesas Electronics Corporation. These parts offer extended supply voltage range (2V ~ 18V) and lower supply current (60 µA). The -T suffix variants provide Cut Tape & Digi-Reel® packaging with higher inventory levels.

Low-Frequency, Low-Power Applications: ICM7555 variants with 500kHz frequency rating (ESA+, ESA+T, ISA+, ISA+T) from Analog Devices Inc./Maxim Integrated are suitable for applications not requiring 3MHz operation. These parts feature the lowest supply current (30 µA) and maintain the full -40°C ~ 85°C operating temperature range of the original LMC555CMX.

Temperature-Extended Range: ICM7555IBAZ and ICM7555IBAZ-T extend the lower operating temperature to -25°C, providing enhanced performance in cold environment applications while maintaining 1MHz frequency capability.

Limited Availability Substitute: ALD7555SAL from Advanced Linear Devices Inc. operates at 2.5MHz with restricted supply voltage range (2V ~ 10V) and narrower temperature range (0°C ~ 70°C). This part is suitable only for applications with compatible voltage and temperature requirements and lower inventory availability.

All substitute parts maintain ROHS3 compliance and MSL Level 1 rating consistent with the original LMC555CMX specification.

Frequently Asked Questions (FAQ)

Q: Can LMC555CMX/NOPB be used as a direct replacement for LMC555CMX?

A: Yes. LMC555CMX/NOPB is electrically and functionally identical to LMC555CMX. The difference is packaging format: LMC555CMX/NOPB uses Tape & Reel (TR) packaging while LMC555CMX uses Cut Tape (CT). Both are 8-SOIC surface mount packages with identical pinout and electrical characteristics. Selection depends on procurement and assembly requirements.

Q: What is the key limitation when substituting with ICM7555 variants?

A: ICM7555 variants operate at maximum frequencies of 1MHz (CBAZ, IBAZ) or 500kHz (ESA+, ISA+), compared to the LMC555CMX's 3MHz rating. These parts are suitable only for applications where the required operating frequency does not exceed the substitute part's maximum frequency specification.

Q: Are all substitute parts compatible with the same PCB layout?

A: Yes. All substitute parts use the 8-SOIC (0.154", 3.90mm Width) surface mount package with identical pinout, ensuring mechanical and electrical compatibility with existing PCB designs. Packaging format differences (Tube, Cut Tape, Tape & Reel) do not affect PCB compatibility.

Q: Which substitute part offers the lowest power consumption?

A: ICM7555 variants rated at 500kHz (ESA+, ESA+T, ISA+, ISA+T) feature the lowest supply current at 30 µA, compared to 150 µA for the LMC555CMX. These parts are optimal for battery-powered or low-power applications operating at frequencies below 500kHz.

Q: What is the supply voltage compatibility range across all substitute options?

A: The LMC555CMX operates at 1.5V ~ 15V. Substitute parts have varying ranges: LMC555CMX/NOPB matches the original (1.5V ~ 15V), ICM7555 variants support 2V ~ 18V, ICM7555 500kHz variants support 2V ~ 16.5V, and ALD7555SAL is limited to 2V ~ 10V. Verify application voltage requirements against each substitute's specification.

Q: Can ALD7555SAL replace LMC555CMX in all applications?

A: No. ALD7555SAL has restricted operating parameters: maximum frequency of 2.5MHz, supply voltage limited to 2V ~ 10V, and operating temperature range of 0°C ~ 70°C. It is suitable only for applications where all requirements fall within these specifications. Additionally, inventory availability is significantly lower (1,184 units).

Q: Which substitute parts maintain the full -40°C ~ 85°C operating temperature range?

A: LMC555CMX/NOPB, ICM7555ESA+, ICM7555ESA+T, ICM7555ISA+, and ICM7555ISA+T maintain the full -40°C ~ 85°C temperature range. Other ICM7555 variants (CBAZ, CBAZ-T, IBAZ, IBAZ-T) operate from 0°C or -25°C to 85°C.

Q: What is the inventory status for long-term procurement?

A: LMC555CMX is in Last Time Buy status with 31,720 units available. LMC555CMX/NOPB (Active status) has 31,756 units. For extended availability, ICM7555CBAZ-T and ICM7555IBAZ-T offer the highest inventory levels (51,420 and 51,910 units respectively) with Active product status.

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